Carbureter.



G. l?. SCHULZ.

` Ummm urLIuA'noI Him) m. 4,-1910. I

v Patented Feb. 17, 1914.

INYEITUR v lwrlfssfs.-

Liu/robuu- I A if/Z I manif! l CARL F. SCHULZ, OF NEW YORK, N. Y.

CARBURETER.

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Specification of Letters Patent.

Patented Feb. 17, 1914.

Application filed March 4, 1910. SeriaINo. 547,314.

To all whom, 'it may concern:

Be itI known that I, CARL F. SCHULZ, of the city of New York, State of New York, have invented certain new and useful Improvements in Carbureters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine.

This invention contemplates new and useful improvements in carbureters.

In an application for Letters Patent filed by Walter F. Schulz on January 26, 1909, Serial No. 474,350, is disclosed a carbureter having an admission valve automatically movable by the suction in the engine cylinder. This admission valve is in the form of a piston and it carries the needle valve controlling the inspirator nozzle. The piston constituting the admission valve is formed with ports adapted to register with ports in the cylinder through which the piston moves. These ports are open to the atmosphere and when they are in register a secondary air supply is admitted to the carbureting chamber. To this extent the construction referred to embodies no new'feature. Its distinguishingcharacteristic, however, resides in the provision for varying the opening admitting the secondary air sup ply by manually operated means without interfering with the automatic movement of the admission valve, thereby proportioning the air to the fuel. Hence when the piston is moved by suction and its ports are brought into alinement with those of the cylinder and the needle valve is being withdrawn from the inspirator nozzle, 1t may happen that the desired proportions of air and fuel do not exist. For instance more fuel may be desired. In this event the operator may turn the piston axially to change the relation of the ports and thereby lessen the opening. This allows the piston to lower further under the force of the 'suction, and admit more fuel without affecting the air supply.

The present invention is adapted to the im roved admission valve above referred to, but) seeks to improve the latter especially with reference to the primaryair supply.

I have found that better results are attained by having the primary as well as the secondary air supply automatically controlled, as by the movement of the admission valve, instead of having it a constant air supply. This creates an additional vacuum on the inspirator nozzle, promoting, the currents of air at that point. provide for adjusting the fuel supplypvalve for starting position by means independent of the automatic control. In the. accompanying drawing, Figurel is a vertical, longitudinal sectional view of a carbureter constructed in accordance with my invention. Figs. 2' and 3 are sectional views on lines 242 and 3 3, respectively, Fig. l.

I have shown a iioat chamber 1, containing the gasoleiie or other liquid hydro-carbon, in communication with the central inspirator nozzle 2, the latter controlled by needle valve 3. At its upper end the inspirator nozzle 2 is formed with a right angular iange 4.

5 indicates the pipe leading to the engine cylinder and v6 the throttle valve therein.

The admission valve consists of a piston 7, movable within the cylinder 8, the piston carrying the needle valve 3 controlling the inspirator nozzle 2. As is well understood in the art, this piston is adapted to be moved downward in its cylinder by the suction in pipe 5 and to open the valve 3 to admit the fuel in, its movement. I have shown the valve 3 at the lower extremity of a stem 9, which latter is inclosed by and threaded in a tube 1() tapped in the upper end of the piston 7. The valve 3 may be an integral part of ythesstem. A sleeve 12 integral with the funnel easing 12a surrounds the tube 1() throughout the greater portion of the length of the latter and is itself encircled by a coiled spring 13, bearing against a seat 14 of the sleeve at one end, and at the other, against the piston 7. The sleeve is' equipped with a right angular arm 15, having a vertical aperture through which extends a rod 16 which is secured to the top of the piston to act as a guide for the latter and prevent the axial turning thereof.

17 designates a primary air valve movable between the walls 18 of the casing of the float chamber, and carried by tube 10 and hence movable with the piston. It has a central passage 19 closed by the flange 4 on.

the inspirator nozzle when the motor is at rest. Above its valve portion proper, 19, this valve is of inverted U shape, andit is shown contacting with the stationary sleeve 12 and iiange 4 -of the inspirator nozzle, as a result of the piston being fully elevated I also under the tension of spring 13 as when the motor is at rest.

The stem 9 may be turned by a handwheel 20 at its upper end to properly adjust the fuel valve 3 in the nozzle tube for starting position. The piston 7 is formed with opposite ports 2l and cylinder 8vis equipped with similar ports 22. The ports of the piston are normally above those of the cylinder and when the piston lowers under the influence of the suction, its ports 21 go into register or alinement with the ports 22 of thecylinder. The cylinder, however, may be turned axially to vary the proportions of fuel and air, as previously described, and

to aid in doing this the outer surface/of the cylinder at its top may be formed with a milled surface 23.

24 is a pin passed through the funnel l2a and the outer casing to hold the'former as against axial movement. In operation, the valve 3 being properly set, the suction created in pipe 5 by operating the engine will cause the piston 7 to lower against the tension of spring 13. As it does so, it carries downward both the fuelvalve 3 and the air valve 17 causing the lat-ter to lower out of contact with the flange l upon the inspirator nozzle to admit the primary air supply. Thus it will be noted that there is no constant air supply at the inspirator nozzle. It does not begin until the fuel supply has started and is directly proportioned to the fuel supply. As the piston lowers as above described, its ports 21 register with ports 22 of the cylinder to admit a further air supply, but this is subject to the manual control of the operator and may therefore be varied as conditions require.

I claim as my invention 1. In a carbureter, the combination 'with the fuel inspirator nozzle and its valve, the pressure member movable by variations of engine suction and automatically controlling said fuel valve by its movement, of

noemer means for admitting a primary air supply to the carbureting chamber, a valve controlling said means, means for admittinga secondary air supply to the carbureting chamber, both of said air supplying means being operated by the automat-ic movementr of said pressure member, and means for varying said secondary air supply without interfering with the automatic movement of said pressure inember and its control of the inspirator fuel valve and the primary air valve.

2. In a carbureter the combination with the casing having a fuel supply valve therein, means for manually adjusting said valve for starting position, and an air valve for controlling the primary air supply to the carbure-ting chamber, of a cylinder 'in said casing, a piston in said cylinder adapted to operate both of said Valves and movable by the suction created bythe engine, ports being formed in said cylinder and piston for admitting a secondary air supply to the carbureting chamber, and means for turning said cylinder axially to vary the ratio of fuel and air.

3. In a carbureter, the combination with the casing having a fuel admission valve therein and an air valve for controlling the primary air supply to the carbureting chamber, of a cylinder in said casing, a piston in said cylinder adapted tov operate both of said valves and movable by the suction created by the engine, ports being formed in said cylinder and piston for admitting a secondary air supply to the carbureting chamber, and means for turning said .cylinder axially to vary the ratio of fuel and air.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

GRAFTON L. MCGILL, H. L. KLOECKNER. 

